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Dec 4, 2019
12/19

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Dr Kévin Beccaria - Hôpital Necker, Paris, France

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Dr Beccaria talks to ecancertv at Children with Cancer UK’s workshop on Drug Delivery in Paediatric Brain Tumours in London, UK. In the interview he discusses how local delivery of pulsed ultrasound could help optimise drug delivery across the blood-brain barrier (BBB). Dr Beccaria notes there have been many preclinical studies showing that the technology works and that the first clinical trial assessing BBB disruption with an implantable ultrasound device is now underway in adults with...

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Jun 30, 2018
06/18

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Matteo Beccaria; Guido Macorini

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We reconsider the one-loop correction to the holographic entanglement entropy in $AdS_{3}/CFT_{2}$ by analysing the contributions due to a bulk higher spin $s$ current or a scalar field with scaling dimension $\Delta$. We consider the two-interval case and work perturbatively in their small cross ratio $x$. We provide various results for the entanglement entropy due to the so-called CDW elements of the associated Schottky uniformization group. In particular, in the higher spin current case, we...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1402.0659

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Sep 18, 2013
09/13

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Matteo Beccaria

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We propose a closed expression for the three loop anomalous dimension of a class of twist-3 operators built with gauge fields and covariant derivatives. To this aim, we solve the long-range Bethe Ansatz equations at finite spin and provide a consistent analytical formula obtained assuming maximal transcendentality violation as suggested by the known one-loop anomalous dimension. The final result reproduces the universal cusp anomalous dimension and obeys recursion relations inspired by the...

Source: http://arxiv.org/abs/0707.1574v1

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Jun 28, 2018
06/18

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M. Beccaria; A. A. Tseytlin

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We compute the conformal anomaly a-coefficient for some non-unitary (higher derivative or non-gauge-invariant) 6d conformal fields and their supermultiplets. We use the method based on a connection between 6d determinants on S^6 and 7d determinants on AdS_7. We find, in particular, that (1,0) supermultiplet containing 4-derivative gauge-invariant conformal vector has precisely the value of a-anomaly as attributed in arXiv:1506.03807 (on the basis of R-symmetry and gravitational 't Hooft...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1506.08727

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Jul 20, 2013
07/13

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B. Alles; M. Beccaria; L. Del Debbio; R. Del Real

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The continuum limit and scaling properties of an asymptotically free field theory regularized on a random lattice are compared with those on a regular square lattice. We work on random lattices parametrized by a degree of ``randomness'' $\kappa$. We show that the continuum limit exists and different $\kappa$ are related by a finite renormalization.

Source: http://arxiv.org/abs/hep-lat/9411014v1

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Sep 21, 2013
09/13

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M. Beccaria; S. Prelovsek; F. M. Renard; C. Verzegnassi

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We consider the process of top-antitop production from electron-positron annihilation, for c. m. energies in the few TeV regime, in the MSSM theoretical framework. We show that, at the one loop level, the \underline{slopes} of a number of observable quantities in an energy region around 3 TeV are only dependent on $\tan\beta$. Under optimal experimental conditions, a combined measurement of slopes might identify $\tan\beta$ values in a range $\tan\beta < 2$, $\tan\beta>20$ with acceptable...

Source: http://arxiv.org/abs/hep-ph/0104245v1

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Jun 30, 2018
06/18

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Eleonora Alfinito; Matteo Beccaria; Alberto Fachechi; Guido Macorini

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Epidemic spreading on complex networks depends on the topological structure as well as on the dynamical properties of the infection itself. Generally speaking, highly connected individuals play the role of hubs and are crucial to channel information across the network. On the other hand, static topological quantities measuring the connectivity structure are independent on the dynamical mechanisms of the infection. A natural question is therefore how to improve the topological analysis by some...

Topics: Physics, Populations and Evolution, Quantitative Biology, Physics and Society

Source: http://arxiv.org/abs/1701.03943

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Jun 29, 2018
06/18

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M. Beccaria; A. A. Tseytlin

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We find a simple relation between a free higher spin field partition function on thermal quotient of AdS(d+1) and the partition function of the associated d-dimensional conformal higher spin field on thermal quotient of AdS(d). Starting with a conformal higher spin field defined on AdS(d) one may also associate to it another conformal field in d-1 dimensions, thus "iterating" AdS/CFT. We observe that in the case of d=4 this iteration leads to a "trivial" 3d higher spin...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1602.00948

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Jun 29, 2018
06/18

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Matteo Beccaria; Alberto Fachechi; Guido Macorini; Luigi Martina

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We consider the $\Omega$-deformed $\mathcal{N}=2$ $SU(2)$ gauge theory in four dimensions with $N_{f}=4$ massive fundamental hypermultiplets. The low energy effective action depends on the deformation parameters $\varepsilon_{1}, \varepsilon_{2}$, the scalar field expectation value $a$, and the hypermultiplet masses ${\bf m}=(m_{1}, m_{2}, m_{3}, m_{4})$. Motivated by recent findings in the $\mathcal{N}=2^{*}$ theory, we explore the theories that are characterized by special fixed ratios...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1609.01189

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Sep 21, 2013
09/13

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M. Beccaria; F. M. Renard; C. Verzegnassi

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We consider the high energy behaviour of the amplitudes for production of leptons, quarks, Higgs bosons, sleptons, squarks, gauge bosons, charginos, neutralinos. We concentrate our discussion on the universal (process independent) logarithmic terms which factorize the Born amplitude and which are typically of the form [a ln(s/m^2)-ln^2(s/m^2)]. We perform a systematic determination of the coefficient "a" for the various final states and we emphasize the striking features which...

Source: http://arxiv.org/abs/hep-ph/0203254v2

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Oct 22, 2019
10/19

by
Beccaria, Cesare, 1738-1794

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158 pages, 2 unnumbered leaves of plates : 21 cm

Topics: Criminology, Crime, Criminals, Xing fa -- yan jiu, Fan zui -- xing fa -- yan jiu

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Jun 28, 2018
06/18

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Matteo Beccaria; Alberto Fachechi; Guido Macorini

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We consider the semiclassical limit of the vacuum Virasoro block describing the diagonal 4-point correlation functions on the sphere. At large central charge c, after exponentiation, it depends on two fixed ratios h_H/c and h_L/c, where h_{H, L} are the conformal dimensions of the 4-point function operators. The semiclassical block may be expanded in powers of the light ratio h_L/c and the leading non-trivial (linear) order is known in closed form as a function of h_H/c. Recently, this...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1511.05452

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Jun 30, 2018
06/18

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Matteo Beccaria; Guido Macorini

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We consider twist $J$ operators with spin $S$ in the $sl(2)$ sector of $\mathcal N=4$ SYM. The small spin expansion of their anomalous dimension defines the so-called slope functions. Much is known about the linear term, but the study of the quadratic correction, the curvature function, started only very recently. At any fixed $J$, the curvature function can be extracted at all loops from the $\mathbf{P}\mu$-system formulation of the Thermodynamical Bethe Ansatz. Here, we work at the one-loop...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1404.0893

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Sep 22, 2013
09/13

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M. Beccaria; H. Eberl; F. M. Renard; C. Verzegnassi

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We consider the production of chargino and charged Higgs boson pairs at future linear colliders for c.m. energies in the one TeV range. Working in the MSSM under the assumption of a "moderately" light SUSY scenario, we compute the leading (double) and next-to leading (linear) supersymmetric logarithmic terms of the so-called "Sudakov expansion" at one loop. We show that a combined analysis of the slopes of the chargino and of the charged Higgs production cross sections would...

Source: http://arxiv.org/abs/hep-ph/0403099v1

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3.0

Jun 30, 2018
06/18

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Matteo Beccaria; Constantin Candu; Matthias R. Gaberdiel

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The most general large ${\cal N}=4$ superconformal ${\cal W}_{\infty}$ algebra, containing in addition to the superconformal algebra one supermultiplet for each integer spin, is analysed in detail. It is found that the ${\cal W}_{\infty}$ algebra is uniquely determined by the levels of the two $\mathfrak{su}(2)$ algebras, a conclusion that holds both for the linear and the non-linear case. We also perform various cross-checks of our analysis, and exhibit two different types of truncations in...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1404.1694

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Jun 29, 2018
06/18

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Matteo Beccaria; Alberto Fachechi; Guido Macorini

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We analyze the cusp anomalous dimension in the (leading) ladder limit of $\mathcal N=4$ SYM and present new results for its higher-order perturbative expansion. We study two different limits with respect to the cusp angle $\phi$. The first is the light-like regime where $x = e^{i\,\phi}\to 0$. This limit is characterised by a non-trivial expansion of the cusp anomaly as a sum of powers of $\log x$, where the maximum exponent increases with the loop order. The coefficients of this expansion have...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1604.00897

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Jun 30, 2018
06/18

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M. Beccaria; A. A. Tseytlin

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We consider general-symmetry higher spin fields in AdS_5 and derive expressions for their one-loop corrections to vacuum energy E and the associated 4d boundary conformal anomaly a-coefficient. We a propose a similar expression for the second conformal anomaly c-coefficient. We show that all the three quantities (E, a, c) computed for N=8 gauged 5d supergravity are -1/2 of the values for N=4 conformal 4d supergravity and also twice the values for N=4 Maxwell multiplet. This gives 5d derivation...

Topics: High Energy Physics - Theory, General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1410.3273

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Jul 20, 2013
07/13

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Matteo Beccaria; Francesca Catino

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The spectrum of anomalous dimensions of twist sl(2) operators in N=4 SYM has an intriguing feature in low twist 2 or 3. The anomalous dimension of the lowest state, dual a folded string on AdS_5 X S^5, can be computed by Bethe Ansatz at 3, 4 loops respectively as a simple closed function of the Lorentz spin. This feature is apparently lost at higher twist. We propose sum rules for the excited anomalous dimensions where closed expressions can still be provided, even at higher twist. We present...

Source: http://arxiv.org/abs/0804.3711v1

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Jun 28, 2018
06/18

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Matteo Beccaria; Arkady A. Tseytlin

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We propose general relations between the conformal anomaly and the chiral (R-symmetry and gravitational) anomaly coefficients in 6d (1,0) superconformal theories. The suggested expressions for the three type B conformal anomaly c-coefficients complement the expression for the type A anomaly a-coefficient found in arXiv:1506.03807. We check them on several examples -- the standard (1,0) hyper and tensor multiplets as well as some higher derivative short multiplets containing vector fields that...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1510.02685

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Jun 30, 2018
06/18

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Matteo Beccaria; Xavier Bekaert; Arkady A. Tseytlin

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We compute the canonical partition function Z of non-interacting conformal higher spin (CHS) theory viewed as a collection of free spin s CFT's in R^d. We discuss in detail the 4-dimensional case (where s=1 is the standard Maxwell vector, s=2 is the Weyl graviton, etc.), but also present a generalization for all even dimensions d. Z may be found by counting the numbers of conformal operators and their descendants (modulo gauge identities and equations of motion) weighted by scaling dimensions....

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1406.3542

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Jun 29, 2018
06/18

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M. Beccaria; S. Nakach; A. A. Tseytlin

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We consider the conformal higher spin (CHS) theory in d=4 that contains the s=1 Maxwell vector, s=2 Weyl graviton and their higher spin s=3,4,... counterparts with higher-derivative \box^s kinetic terms. The interacting action for such theory can be found as the coefficient of the logarithmically divergent part in the induced action for sources coupled to higher spin currents in a free complex scalar field model. We explicitly determine some cubic and quartic interaction vertices in the CHS...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1607.06379

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Sep 19, 2013
09/13

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Matteo Beccaria; Guido Macorini; Alin Tirziu

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We present results for the one-loop correction to the energy of a class of string solutions in AdS_5 x S^5 in the short string limit. The computation is based on the observation that, as for rigid spinning string elliptic solutions, the fluctuation operators can be put into the single-gap Lame' form. Our computation reveals a remarkable universality of the form of the energy of short semiclassical strings. This may help to understand better the structure of the strong coupling expansion of the...

Source: http://arxiv.org/abs/1009.5182v1

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Jun 30, 2018
06/18

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M. Beccaria; A. A. Tseytlin

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We continue the investigation of the structure of the action for a tower of conformal higher spin fields in non-trivial 4d background metric recently discussed in arXiv:1609.09381. The action is defined as an induced one from path integral of a conformal scalar field in curved background coupled to higher spin fields. We analyse in detail the dependence of the quadratic part of the induced action on the spin 1 and spin 3 fields, determining the presence of a curvature-dependent mixed spin 1 -...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1702.00222

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Sep 19, 2013
09/13

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Matteo Beccaria; Fernand M. Renard; Stefania Spagnolo; Claudio Verzegnassi

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We discuss New Physics effects in fermion pair production at LC in the framework of the ``Z-peak subtracted approach'', a theoretical scheme that exploits the experimental measurements at LEP1 and SLC as input parameters. In particular, we discuss the role of the longitudinal polarization asymmetry $A_{LR,\mu}$ which turns out to be a very sensitive probe to New Physics of universal type. The extension of the method to non universal effects is discussed and an application is given in two...

Source: http://arxiv.org/abs/hep-ph/9911359v1

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3.0

Jun 29, 2018
06/18

by
Matteo Beccaria

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We study the multi-instanton partition functions of the $\Omega$-deformed $\mathcal N =2^{*}$ $SU(2) $ gauge theory in the Nekrasov-Shatashvili (NS) limit. They depend on the deformation parameters $\epsilon_{1}$, the scalar field expectation value $a$, and the hypermultiplet mass $m$. At fixed instanton number $k$, they are rational functions of $\epsilon_{1}, a, m$ and we look for possible regularities that admit a parametrical description in the number of instantons. In each instanton...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1605.00077

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Sep 23, 2013
09/13

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Matteo Beccaria; Guido Macorini

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We consider integrable superstring theory on AdS_3 x S^3 x M^4 where M^4=T^4 or M^4=S^3 x S^1 with generic ratio of the radii of the two 3-spheres. We compute the one-loop energy of a short folded string spinning in AdS_3 and rotating in S^3. The computation is performed by world-sheet small spin perturbation theory as well as by quantizing the classical algebraic curve characterizing the finite-gap equations. The two methods give equal results up to regularization contributions that are under...

Source: http://arxiv.org/abs/1212.5672v2

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Sep 20, 2013
09/13

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M. Beccaria; V. Forini; G. Macorini

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Planar N=4 SYM theory and QCD share the gluon sector, suggesting the investigation of Gribov-Lipatov reciprocity in the supersymmetric theory. Since the AdS/CFT correspondence links N=4 SYM and superstring dynamics on AdS5xS5, reciprocity is also expected to show up in the quantum corrected energies of certain classical string configurations dual to gauge theory twist-operators. We review recent results confirming this picture and revisiting the old idea of Gribov-Lipatov reciprocity as a...

Source: http://arxiv.org/abs/1002.2363v2

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Jun 29, 2018
06/18

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Matteo Beccaria; Guido Macorini

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We study the low energy effective action of the $\Omega$-deformed $\mathcal N =2^{*}$ $SU(2) $ gauge theory. It depends on the deformation parameters $\epsilon_{1},\epsilon_{2}$, the scalar field expectation value $a$, and the hypermultiplet mass $m$. We explore the plane $(\frac{m}{\epsilon_{1}}, \frac{\epsilon_{2}}{\epsilon_{1}})$ looking for special features in the multi-instanton contributions to the prepotential, motivated by what happens in the Nekrasov-Shatashvili limit $\epsilon_{2}\to...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1606.00179

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Sep 24, 2013
09/13

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M. Beccaria; F. M. Renard; C. Verzegnassi

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We consider the separate effects on four fermion processes, in the TeV energy range, produced at one loop by Sudakov logarithms of universal and not universal kind, working in the 't Hooft xi=1 gauge. Summing the various vertex and box contributions allows to isolate two quite different terms.The first one is a combination of vertex and box quadratic and linear logarithms that are partially universal and partially not universal and independent of the scattering angle theta. The second one is...

Source: http://arxiv.org/abs/hep-ph/0103335v2

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Sep 18, 2013
09/13

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M. Beccaria; F. M. Renard; S. Trimarchi; C. Verzegnassi

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We consider the production, at future lepton colliders, of charged Higgs pairs in supersymmetric models. Assuming a relatively light SUSY scenario, and working in the MSSM, we show that, for c.m. energies in the one TeV range, a one-loop logarithmic Sudakov expansion that includes an "effective" next-to subleading order term is adequate to the expected level of experimental accuracy. We consider then the coefficient of the linear (subleading) SUSY Sudakov logarithm and the SUSY next...

Source: http://arxiv.org/abs/hep-ph/0212167v1

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Sep 18, 2013
09/13

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Matteo Beccaria; Giulio Soliani

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Nonlinear systems of the reaction-diffusion type, including Gierer-Meinhardt models of autocatalysis, are studied by using Lie algebras coming from the prolongation structure. The consequences of this analytical approach, as the determination of special exact solutions, are compared with the corresponding results obtained via numerical simulations.

Source: http://arxiv.org/abs/cond-mat/9710308v1

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Sep 18, 2013
09/13

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M. Beccaria; V. Forini; A. Tirziu; A. A. Tseytlin

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The anomalous dimensions of planar N=4 SYM theory operators like tr(Phi D^S Phi) expanded in large spin S have the asymptotics \gamma= f ln S + f_c + 1/S (f_11 ln S + f_10) + ..., where f (the universal scaling function or cusp anomaly), f_c and f_mn are given by power series in the `t Hooft coupling \lambda. The subleading coefficients appear to be related by the so called functional relation and parity invariance (or reciprocity) property of the function expressing \gamma in terms of the...

Source: http://arxiv.org/abs/0809.5234v4

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Jun 30, 2018
06/18

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M. Beccaria; A. A. Tseytlin

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We consider an example of vectorial AdS_5/CFT_4 duality when the boundary theory is described by N free complex or real Maxwell fields. It is dual to a particular ("type C") higher spin theory in AdS_5 containing fields in special mixed-symmetry representations. We extend the study of this theory in arXiv:1410.3273 by deriving the expression for the large N limit of the corresponding singlet-sector partition function on S^1 x S^3. We find that in both complex U(N) and real O(N)...

Topic: High Energy Physics - Theory

Source: http://arxiv.org/abs/1410.4457

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Jul 20, 2013
07/13

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M. Beccaria; P. Ciafaloni; D. Comelli; F. M. Renard; C. Verzegnassi

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Starting from a theoretical representation of the electroweak component of four-fermion neutral current processes that uses as theoretical input the experimental measurements at the Z peak, we consider the asymptotic high energy behaviour in the Standard Model at one loop of those gauge-invariant combinations of self-energies, vertices and boxes that contribute all the different observables. We find that the logarithmic contribution due to the renormalization group running of the various...

Source: http://arxiv.org/abs/hep-ph/9906319v2

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Nov 8, 2018
11/18

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J. B. Beccaria; M. Maty

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This paper is in the public domain in USA. Metadata comes from the CrossRef API, see full record in the source URL below.

Topic: journals

Source: https://api.crossref.org/works/10.1098/rstl.1767.0034

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Sep 23, 2013
09/13

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J. Baglio; M. Beccaria; A. Djouadi; G. Macorini; E. Mirabella; N. Orlando; F. M. Renard; C. Verzegnassi

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Many extensions of the Standard Model involve two Higgs doublet fields to break the electroweak symmetry, leading to the existence of three neutral and two charged Higgs particles. In particular, this is the case of the Minimal Supersymmetric extension of the Standard Model, the MSSM. A very important parameter is $\tan\beta$ defined as the ratio of the vacuum expectation value of the two Higgs doublets. In this paper we focus on the left-right asymmetry in the production of polarised top...

Source: http://arxiv.org/abs/1109.2420v1

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Sep 19, 2013
09/13

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Matteo Beccaria; Edoardo Mirabella

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We consider the electroweak radiative corrections in the MSSM and study the purely Yukawa contributions ${\cal O}(\alpha^L y_t^{2p} y_b^{2q})$, $p+q=L$, where $y_{t,b}$ are the top and bottom quark Yukawa couplings. We show that these corrections can be computed in a gaugeless limit of the MSSM where they are under Renormalization Group control. As an application, we present explicit results for various ILC and LHC processes valid at all orders in the loop expansion and at leading order in the...

Source: http://arxiv.org/abs/hep-ph/0507070v1

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Sep 18, 2013
09/13

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M. Beccaria; C. M. Carloni Calame; G. Macorini; G. Montagna; F. Piccinini; F. M. Renard; C. Verzegnassi

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We compute, in the MSSM framework, the sum of the one-loop electroweak and of the total QED radiation effects for the process $pp \to t W+X$, initiated by the parton process $bg\to tW$. Combining these terms with the existing NLO calculations of SM and SUSY QCD corrections, we analyze the overall one-loop supersymmetric effects on the partial rates of the process, obtained by integrating the differential cross section up to a final variable invariant mass. We conclude that, for some choices of...

Source: http://arxiv.org/abs/0705.3101v2

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Sep 21, 2013
09/13

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Matteo Beccaria; Guido Macorini

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We propose a twisted Y-system for the calculation of leading wrapping corrections to physical states of general Z_S orbifold projections of N=4 super Yang-Mills theory. Agreement with available thermodynamical Bethe Ansatz results is achieved in the non supersymmetric case. Various examples of new computations, including other supersymmetric orbifolds are illustrated.

Source: http://arxiv.org/abs/1104.0883v2

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Sep 19, 2013
09/13

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M. Beccaria; P. Ciafaloni; D. Comelli; F. M. Renard; C. Verzegnassi

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We examine the possibility that SUSY particles are light, i.e. have a mass just beyond the final kinematical reach of LEP2. In this case, even if light particles are not directly detected, their virtual effects are enhanced by a ``close to threshold'' resonance in the s-channel. We find that this resonant effect is absent in the case of light sfermions, while it is enhanced in the case of light gauginos, since neutralinos and charginos add coherently in some regions of the allowed parameter...

Source: http://arxiv.org/abs/hep-ph/9812484v3

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Sep 17, 2013
09/13

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M. Beccaria; G. J. Gounaris; J. Layssac; F. M. Renard

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We write explicit and self-contained asymptotic expressions for the tensorial B, C and D Passarino-Veltman functions. These include quadratic and linear logarithmic terms, as well as subleading constant terms. Only mass-suppressed O(m^2/s) contributions are neglected. We discuss the usefulness of such expressions, particularly for studying one-loop effects in 2-to-2 body processes at high energy.

Source: http://arxiv.org/abs/0711.1067v2

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Sep 19, 2013
09/13

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Matteo Beccaria; Giuseppe Curci

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Using an operatorial formalism, we study the Kramers equation and its applications to numerical simulations. We obtain classes of algorithms which may be made precise at every desired order in the time step $\epsilon$ and with a set of free parameters which can be used to reduce autocorrelations. We show that it is possible to use a global Metropolis test to restore Detailed Balance.

Source: http://arxiv.org/abs/hep-lat/9307007v1

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Sep 20, 2013
09/13

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Matteo Beccaria; Arkady A. Tseytlin

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We continue investigation of the spectrum of semiclassical quantum strings in AdS5 x S5 on the examples of folded (S,J) string (with spin S in AdS5 and orbital momentum J in S5) dual to an sl(2) sector state in gauge theory and its (J',J) counterpart with spin J' in S5 dual to an su(2) sector state. We study the limits of small spins and large J at weak and strong coupling, pointing out that terms linear in spins provide a generalization of "protected" coefficients in the energy that...

Source: http://arxiv.org/abs/1205.3656v3

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Sep 20, 2013
09/13

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Matteo Beccaria; Carlo Presilla; Gian Fabrizio De Angelis; Giovanni Jona-Lasinio

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We present a simple derivation of a Feynman-Kac type formula to study fermionic systems. In this approach the real time or the imaginary time dynamics is expressed in terms of the evolution of a collection of Poisson processes. A computer implementation of this formula leads to a family of algorithms parametrized by the values of the jump rates of the Poisson processes. From these an optimal algorithm can be chosen which coincides with the Green Function Monte Carlo method in the limit when the...

Source: http://arxiv.org/abs/cond-mat/9810347v3

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Sep 22, 2013
09/13

by
M. Beccaria; G. Macorini; L. Panizzi; F. M. Renard; C. Verzegnassi

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The process of charged Higgs production in association with a top quark at the LHC has been calculated at the complete NLO electroweak level both in a Two Higgs Doublets Model and in the Minimal Supersymmetric Standard Model, assuming a mSUGRA breaking scheme. We have numerically explored the size of the one-loop corrections in two typical supersymmetric scenarios, with particular attention to the tan beta dependence, and we have found that they remain perturbatively small but possibly sizable,...

Source: http://arxiv.org/abs/0908.1332v2

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Sep 22, 2013
09/13

by
M. Beccaria; G. Macorini; E. Mirabella; L. Panizzi; F. M. Renard; C. Verzegnassi

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The process of stop-chargino production at LHC has been calculated in the Minimal Supersymmetric Standard Model at the complete electroweak one-loop level, assuming a mSUGRA symmetry breaking scheme. Several properties of the angular and invariant mass distributions of the basic bottom-gluon to stop-chargino amplitudes have been derived. For a meaningful collection of different benchmark points the overall electroweak one-loop effects are at most of the order of a few percent. At the...

Source: http://arxiv.org/abs/0812.4375v3

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Sep 19, 2013
09/13

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Matteo Beccaria; Guido Macorini

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Recently, Kazakov, Gromov and Vieira applied the discrete Hirota dynamics to study the finite size spectra of integrable two dimensional quantum field theories. The method has been tested from large values of the size L down to moderate values using the SU(2) x SU(2) principal chiral model as a theoretical laboratory. We continue the numerical analysis of the proposed non-linear integral equations showing that the deep ultraviolet region L -> 0 is numerically accessible. To this aim, we...

Source: http://arxiv.org/abs/1009.3428v1

Letter from Mr. John Baptist Beccaria, of Turin, F. R. S. to Mr. John Canton, F. R. S. on His New Phosphorus Receiving Several Colours, and Only Emitting the Same. Beccaria, J Philosophical Transactions (1683-1775). 1771-01-01. 61:212–212

Topics: Proceedings of the Royal Society of London, Philosophical Transactions of the Royal Society

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Sep 19, 2013
09/13

by
Matteo Beccaria; Fernand M. Renard; Claudio Verzegnassi

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We compare the logarithmic Sudakov expansions of the process e+e- --> W+W- in the one-loop approximation and in the resummed version, to subleading order accuracy, in the SM case and in a light SUSY scenario for the MSSM. We show that the two expansions are essentially identical below 1 TeV, but differ drastically at higher (2,3 TeV) center of mass energies. Starting from these conclusions, we argue that a complete one-loop calculation in the energy region below 1 TeV does not seem to need...

Source: http://arxiv.org/abs/hep-ph/0304175v1

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Sep 19, 2013
09/13

by
Guido Macorini; Matteo Beccaria

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We extend the anlysis of the generalized Gribov-Lipatov reciprocity to the higher conserved charges of type IIB superstring on AdS5 x S5. The property is shown to hold for twist 2, and 3 operators in the sl(2) subsector.

Source: http://arxiv.org/abs/1009.5559v1